package simpleftp.client.control;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

import simpleftp.client.gui.FTPClientWindow;

public class CommandDispatcher implements Runnable 
{
	public static final String NL = "\n";
	private static final String USER = "USER";
	private static final String PASS = "PASS";
	private static final String SERVER = "SERVER";
	private static final String PORT = "PORT";
	private static final String SETTINGS_ROOT = "simpleftpsettings";
	private static final String DEFAULT_SETTINGS = SETTINGS_ROOT + "/default";
	private static final String LAST_SETTINGS = SETTINGS_ROOT + "/last";
	private static final String DEF_USER = "paris";
	private static final String DEF_PASS = "paris";
	private static final String DEF_SERVER = "127.0.0.1";
	private static final String DEF_PORT = "7802";
	private final ExecutorService executorPool;
	private final CompletionService<Boolean> completionPool;
	private final FTPClientWindow window;
	private final int numberOfCores;
	private final double blockingCoefficient = 0.9;
	private final int poolSize;
	private BlockingQueue<Command> commands;
	private SimpleFTP client;
	private Preferences userPrefs;
	private String server;
	private String port;
	private String user;
	private String pass;
	private boolean alreadyConnected;

	public CommandDispatcher(BlockingQueue<Command> commandQueue, FTPClientWindow window) 
	{
		this.commands = commandQueue;
		this.window = window;
		alreadyConnected = false;
		numberOfCores = Runtime.getRuntime().availableProcessors();
		poolSize = (int) (numberOfCores / (1 - blockingCoefficient));
		executorPool = Executors.newFixedThreadPool(poolSize);
		completionPool = new ExecutorCompletionService<Boolean>(executorPool);
		client = new SimpleFTP();
	}

	@Override
	public void run() {
		try {
			loadStartupPreferences();
			Command cmd = this.commands.take();
			while (!cmd.equals(Command.QUIT)) {
				switch (cmd) {
				case CONNECT:
					connect();
					break;
				case DISCONNECT:
					disconnect();
					break;
				case STOR:
					upload();
					break;
				case LIST:
					listDir();
					break;
				case RETR:
					download();
					break;
				case PWD:
					pwd();
					break;
				/* Change : include the CWD functionality*/	
			    case CWD:
                    cwd();
                    break;
                    
				case CLEAR:
					clearConsole();
					break;
				case LOADPREFS:
					loadPreferences();
					break;
				case SAVEPREFS:
					savePreferences();
					break;
				case DELPREF:
					deletePreference();
					break;
				default:
					break;
				}
				cmd = this.commands.take();
			}
			saveLastPreferences();
			disconnect();
			executorPool.shutdown();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

	private void clearConsole() {
		window.console.setText("");
	}

	private void saveLastPreferences() 
	{
		userPrefs = Preferences.userRoot().node(LAST_SETTINGS);
		userPrefs.put(USER, window.tfusername.getText());
		userPrefs.put(PASS, new String(window.pfuserpass.getPassword()));
		userPrefs.put(SERVER, window.tfservername.getText());
		userPrefs.put(PORT, window.tfport.getText());
		try {
			userPrefs.flush();
		} catch (BackingStoreException e) {
			e.printStackTrace();
		}
	}

	private void loadStartupPreferences() 
	{
		try {
			userPrefs = Preferences.userRoot();
			if (!userPrefs.nodeExists(DEFAULT_SETTINGS)) {
				userPrefs = Preferences.userRoot().node(DEFAULT_SETTINGS);
				userPrefs.put(USER, DEF_USER);
				userPrefs.put(PASS, DEF_PASS);
				userPrefs.put(SERVER, DEF_SERVER);
				userPrefs.put(PORT, DEF_PORT);
				userPrefs.flush();
			}
			if (userPrefs.nodeExists(LAST_SETTINGS)) {
				userPrefs = Preferences.userRoot().node(LAST_SETTINGS);
			} 
			window.tfusername.setText(userPrefs.get(USER, DEF_USER));
			window.pfuserpass.setText(userPrefs.get(PASS, DEF_PASS));
			window.tfservername.setText(userPrefs.get(SERVER, DEF_SERVER));
			window.tfport.setText(userPrefs.get(PORT, DEF_PORT));
		} 
		catch (BackingStoreException e) 
		{
			e.printStackTrace();
		}
	}
	
	private void loadPreferences() {
		try {
			userPrefs = Preferences.userRoot().node(SETTINGS_ROOT);
			String[] userSavedPrefs = userPrefs.childrenNames();
			String s = (String) JOptionPane.showInputDialog(window,
					"Choose preference to load:", "Load Preferences",
					JOptionPane.QUESTION_MESSAGE, null, userSavedPrefs, userSavedPrefs[0]);
			if ((s != null) && (s.length() > 0)) {
				userPrefs = Preferences.userRoot().node(SETTINGS_ROOT + "/" + s);
				window.tfusername.setText(userPrefs.get(USER, DEF_USER));
				window.pfuserpass.setText(userPrefs.get(PASS, DEF_PASS));
				window.tfservername.setText(userPrefs.get(SERVER, DEF_SERVER));
				window.tfport.setText(userPrefs.get(PORT, DEF_PORT));
				
				window.console.append(NL + "User preferences " + s + " loaded.");
			} else {
				window.console.append(NL + "Preferences loading operation cancelled.");
			}
		} catch (BackingStoreException e) {
			e.printStackTrace();
		}
	}

	private void savePreferences() {
		String s = (String) JOptionPane.showInputDialog(window,
				"Save the current connection info as:", "Save Preferences",
				JOptionPane.QUESTION_MESSAGE, null, null, null);
		if ((s != null) && (s.length() > 0)) {
			userPrefs = Preferences.userRoot().node(SETTINGS_ROOT + "/" + s);
			userPrefs.put(USER, window.tfusername.getText());
			userPrefs.put(PASS, new String(window.pfuserpass.getPassword()));
			userPrefs.put(SERVER, window.tfservername.getText());
			userPrefs.put(PORT, window.tfport.getText());
			try {
				userPrefs.flush();
			} catch (BackingStoreException e) {
				window.console.append(NL + "Could not save preferences: "
						+ e.getMessage());
				e.printStackTrace();
			}
			window.console.append(NL + "Preferences saved as " + s);
		} else {
			window.console.append(NL + "Preferences saving operation cancelled.");
		}
	}
	
	private void deletePreference() {
		try {
			userPrefs = Preferences.userRoot().node(SETTINGS_ROOT);
			String[] userSavedPrefs = userPrefs.childrenNames();
			String s = (String) JOptionPane.showInputDialog(window,
					"Choose preference to delete:", "Delete Preference",
					JOptionPane.QUESTION_MESSAGE, null, userSavedPrefs, userSavedPrefs[0]);
			if ((s != null) && (s.length() > 0)) {
				userPrefs = Preferences.userRoot().node(SETTINGS_ROOT + "/" + s);
				userPrefs.removeNode();
				userPrefs.flush();
				window.console.append(NL + "User preferences " + s + " deleted.");
			} else {
				window.console.append(NL + "Preferences deletion operation cancelled.");
			}
		} catch (BackingStoreException e) {
			e.printStackTrace();
		}
	}
	/* Change : Download method*/
	private void download() 
	{
        if (!alreadyConnected) 
        {
                window.console.append(NL + "You are not connected to any server.");
                return;
        }
        /* Change : instantiate a new File chooser*/
        final JFileChooser fc = new JFileChooser();
        fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        int returnVal = fc.showDialog(window, "Download directory");
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            /* Change : we store the selected Path in a TreePath*/
        	
             TreePath dl = window.tree.getSelectionPath();
                String pathname = "";
                /* Change : We get all the part of the path thanks to the getPath method*/
                Object[] path_part = dl.getPath();
                /* Change : We build the absolute path of the file this is very important, if we don't do that 
                 * we will never be able to download file that are not in the workspace (user.dir)*/
                String [] strs = client.getNewPath().split(System.getProperty("file.separator"));
                boolean ok=false;
                boolean check= false;
                pathname=client.getNewPath();
                for (Object part: path_part){
                for(String str : strs){

                	if(str.equals(part.toString())){
                		ok=true;
                	}
                	else if(ok && check==false) {
                		check = true;
                		pathname+=System.getProperty("file.separator")+part;
                	}
                	 }
                check=false;
                }
                     
                /*Change : we run the thread with an instance of the Download class */       
               completionPool.submit(new Download(pathname,new File(pathname), fc.getSelectedFile(), window, server, port, user, pass));
                
        }
        else
                window.console.append(NL + "Upload action cancelled.");
	}

	/* Change : Upload function*/
	private void upload() 
	{
		if (!alreadyConnected) {
			window.console.append(NL + "You are not connected to any server.");
			return;
		}
		final JFileChooser fc = new JFileChooser();
		fc.setFileSelectionMode(JFileChooser.FILES_ONLY);
		fc.setMultiSelectionEnabled(true);
		fc.setDragEnabled(true);
		int returnVal = fc.showDialog(window, "Upload");
		if (returnVal == JFileChooser.APPROVE_OPTION) 
		{
			/* Change : We recover the uploaded files and store it in an array of File*/
			File[] files = fc.getSelectedFiles();
			List<Future<Boolean>> uploaders = new ArrayList<Future<Boolean>>(files.length);
		
			
			for (File file : files) 
			{
				/* Change : Import to upload in the right directory and not the initial one*/

				String pathname = client.getNewPath() +System.getProperty("file.separator") + file.getName();
				client.setUpload(pathname);
				Uploader uploader = new Uploader (pathname,file, window, server, port, user, pass);
				uploaders.add(completionPool.submit(uploader));
				/* Change : We add file to the PWD*/
				 DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(file.getName());
                 window.root.add(childNode);
          
			}
			/* Change : We update the tree*/
			window.tree.updateUI();
		}
		else 
		{
			window.console.append(NL + "Upload action cancelled.");
		}
	}

	private void listDir() 
	{
		if (!alreadyConnected) 
		{
			window.console.append(NL + "You are not connected to any server.");
			return;
		}
		try {
			// TODO complete / rewrite to get the file tree from the server.
			/* Change : */
			
            File f = client.ls(); 
            window.root = new DefaultMutableTreeNode(f.getName()); 
            /* Change : We populate the tree*/
            populateTree(window.root, f);
            /* Change : We update the tree*/
            window.tree.setModel(new DefaultTreeModel(window.root)); 
            window.tree.updateUI(); 
            
		} catch (IOException e) {
			window.console.append(NL + e.getMessage());
			e.printStackTrace();
		}

	}
	
	/* Change :method to populate the tree*/
	private void populateTree(DefaultMutableTreeNode userRoot, File root) {
		// TO BE COMPLETED - WRITE THIS RECURSIVE METHOD - 7 LINES
		File[] files = root.listFiles();
	    for (File childFile : files) {
	        DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(childFile.getName());
	        userRoot.add(childNode); 
	        if (childFile.isDirectory())
	                populateTree(childNode, childFile);
	    }
	}

	private void pwd() {
		try {
			if (!alreadyConnected) {
				window.console.append(NL + "You are not connected to any server.");
				return;
			}
			String curDir = client.pwd();
			client.setNewPath(curDir);
			window.console.append(NL + "Current directory on FTP server: " + curDir);
		} catch (IOException e) {
			window.console.append(NL + e.getMessage());
			e.printStackTrace();
		}
	}
	
	/* Change :CWD function*/
    private void cwd() {
        if (!alreadyConnected) {
                window.console.append(NL + "You are not connected to any server.");
                return;
        }
        /* Change : We instantiate a file chooser to select a new directory*/
        final JFileChooser fc = new JFileChooser();
		fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
		fc.setMultiSelectionEnabled(false);
		fc.setDragEnabled(true);
		int returnVal = fc.showDialog(window, "Change Directory");
		if (returnVal == JFileChooser.APPROVE_OPTION) 
		{

			/* Change : We store the file, we populate the tree and we update the Tree*/
				try {
					/* Change : We send the newPath to the SimpleFtp cwd method, we store the file and then we create 
					 * the tree*/
					File file =client.cwd((fc.getSelectedFile()).getPath());
					String path =fc.getSelectedFile().getAbsolutePath();
					client.setNewPath(path);
					
		            window.root = new DefaultMutableTreeNode(file.getName()); 
		            populateTree(window.root, file); 
		            window.tree.setModel(new DefaultTreeModel(window.root)); 
		            window.tree.updateUI();
		            String curDir = client.pwd();
					window.console.append(NL + "Current directory on FTP server: " + curDir);
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				

		}
}

	private void disconnect() {
		try {
			if (alreadyConnected) {
				client.disconnect();
				alreadyConnected = false;
				window.console.append(NL + "Now disconnected");
			} else {
				window.console.append(NL + "Already disconnected");
			}
		} catch (IOException e) {
			window.console.append(NL + e.getMessage());
			e.printStackTrace();
		}

	}

	private void connect() {
		if (alreadyConnected) {
			window.console.append(NL
					+ "You are already connected to this server.");
			return;
		}
		server = window.tfservername.getText();
		if (server == null || "".equals(server)) {
			window.console.append(NL
					+ "You must specify the server IP address.");
			return;
		}
		port = window.tfport.getText();
		if (port == null || "".equals(port)) {
			window.console.append(NL
					+ "You must specify the server port I must connect to.");
			return;
		}
		user = window.tfusername.getText();
		if (user == null || "".equals(user))
			user = "anonymous";
		pass = new String(window.pfuserpass.getPassword());
		if (pass == null || "".equals(pass))
			pass = "anonymous";
		try {
			client.connect(server, Integer.parseInt(port), user, pass);
			alreadyConnected = true;
			window.console.append(NL + "Now connected");
			pwd();
			listDir();
		} catch (IOException e) {
			window.console.append(NL + e.getMessage());
			e.printStackTrace();
		} catch (NumberFormatException nfe) {
			window.console.append(NL + nfe.getMessage());
			nfe.printStackTrace();
		}
	}
}
